Author: WEXA

Heat wave occuring from December 29 2025 to December 31 2025 at -31.5°S 23.0°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Namibia
  • South Africa

Duration: 3 days

Time span: December 29 2025 to December 31 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 4.4 °C
  • Mean temperature: 30.6 °C
  • Maximum temperature anomaly: 6.0 °C
  • Maximum temperature: 33.2 °C

Event center: -31.5°S 23.0°E

Area affected: 59080 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Dec-29_to_2025-Dec-31_23.0_-31.5

Heat wave occuring from December 29 2025 to January 07 2026 at 48.0°N 83.0°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • China
  • Kazakhstan

Duration: 10 days

Time span: December 29 2025 to January 07 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 8.5 °C
  • Mean temperature: -6.1 °C
  • Maximum temperature anomaly: 14.6 °C
  • Maximum temperature: 0.7 °C

Event center: 48.0°N 83.0°E

Area affected: 119646 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Dec-29_to_2026-Jan-07_83.0_48.0

Cold spell occuring from December 29 2025 to January 07 2026 at 37.5°N 39.0°E

Download data: JSON

Event type: Cold spell

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Syrian Arab Republic
  • Türkiye

Duration: 10 days

Time span: December 29 2025 to January 07 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -6.9 °C
  • Mean temperature: -3.2 °C
  • Minimum temperature anomaly: -15.0 °C
  • Minimum temperature: -15.9 °C

Event center: 37.5°N 39.0°E

Area affected: 149864 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2025-Dec-29_to_2026-Jan-07_39.0_37.5

Cold spell occuring from December 28 2025 to January 01 2026 at -3.0°S 36.0°E

Download data: JSON

Event type: Cold spell

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Kenya
  • Tanzania, United Republic of

Duration: 5 days

Time span: December 28 2025 to January 01 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -2.5 °C
  • Mean temperature: 19.8 °C
  • Minimum temperature anomaly: -5.7 °C
  • Minimum temperature: 15.0 °C

Event center: -3.0°S 36.0°E

Area affected: 191201 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2025-Dec-28_to_2026-Jan-01_36.0_-3.0

Cold spell occuring from December 28 2025 to January 01 2026 at -29.5°S 122.5°E

Download data: JSON

Event type: Cold spell

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Australia

Duration: 5 days

Time span: December 28 2025 to January 01 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -5.4 °C
  • Mean temperature: 19.3 °C
  • Minimum temperature anomaly: -9.9 °C
  • Minimum temperature: 15.3 °C

Event center: -29.5°S 122.5°E

Area affected: 222531 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2025-Dec-28_to_2026-Jan-01_122.5_-29.5

Heat wave occuring from December 28 2025 to December 30 2025 at 64.5°N 184.5°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Russian Federation

Duration: 3 days

Time span: December 28 2025 to December 30 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 10.5 °C
  • Mean temperature: -0.3 °C
  • Maximum temperature anomaly: 12.8 °C
  • Maximum temperature: 1.5 °C

Event center: 64.5°N 184.5°E

Area affected: 54417 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Dec-28_to_2025-Dec-30_184.5_64.5

Heat wave occuring from December 28 2025 to January 18 2026 at 0.5°N 311.0°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Brazil

Duration: 22 days

Time span: December 28 2025 to January 18 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 1.0 °C
  • Mean temperature: 27.1 °C
  • Maximum temperature anomaly: 2.9 °C
  • Maximum temperature: 28.9 °C

Event center: 0.5°N 311.0°E

Area affected: 933208 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Dec-28_to_2026-Jan-18_311.0_0.5

Heat wave occuring from December 28 2025 to January 01 2026 at 10.5°N 47.5°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Somalia

Duration: 5 days

Time span: December 28 2025 to January 01 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 2.1 °C
  • Mean temperature: 22.1 °C
  • Maximum temperature anomaly: 3.4 °C
  • Maximum temperature: 23.7 °C

Event center: 10.5°N 47.5°E

Area affected: 66944 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Dec-28_to_2026-Jan-01_47.5_10.5

Heat wave occuring from December 28 2025 to December 30 2025 at 30.0°N 61.5°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Afghanistan
  • Iran, Islamic Republic of
  • Pakistan

Duration: 3 days

Time span: December 28 2025 to December 30 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 6.8 °C
  • Mean temperature: 15.9 °C
  • Maximum temperature anomaly: 10.4 °C
  • Maximum temperature: 20.8 °C

Event center: 30.0°N 61.5°E

Area affected: 199410 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Dec-28_to_2025-Dec-30_61.5_30.0

Heat wave occuring from December 28 2025 to January 03 2026 at -65.0°S 280.5°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Antarctica

Duration: 7 days

Time span: December 28 2025 to January 03 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 1.5 °C
  • Mean temperature: 2.4 °C
  • Maximum temperature anomaly: 2.6 °C
  • Maximum temperature: 5.5 °C

Event center: -65.0°S 280.5°E

Area affected: 632095 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Dec-28_to_2026-Jan-03_280.5_-65.0